[INFO] fetching crate potpack 0.1.2...
[INFO] checking potpack-0.1.2 against master#c919f490bbcd2b29b74016101f7ec71aaa24bdbb for pr-79073
[INFO] extracting crate potpack 0.1.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate potpack 0.1.2 on toolchain c919f490bbcd2b29b74016101f7ec71aaa24bdbb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate potpack 0.1.2
[INFO] finished tweaking crates.io crate potpack 0.1.2
[INFO] tweaked toml for crates.io crate potpack 0.1.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate potpack 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eed99d471e5bfba2a0a0c9b8ac32e847488998dbd928c28029ac41518cc0b717
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "eed99d471e5bfba2a0a0c9b8ac32e847488998dbd928c28029ac41518cc0b717", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eed99d471e5bfba2a0a0c9b8ac32e847488998dbd928c28029ac41518cc0b717", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eed99d471e5bfba2a0a0c9b8ac32e847488998dbd928c28029ac41518cc0b717", kill_on_drop: false }`
[INFO] [stdout] eed99d471e5bfba2a0a0c9b8ac32e847488998dbd928c28029ac41518cc0b717
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+c919f490bbcd2b29b74016101f7ec71aaa24bdbb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b36fab50bab21b2e092aab27333e61df14a40f8a504e0316db63cfa7dd4f6004
[INFO] running `Command { std: "docker" "start" "-a" "b36fab50bab21b2e092aab27333e61df14a40f8a504e0316db63cfa7dd4f6004", kill_on_drop: false }`
[INFO] [stderr]     Checking potpack v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `PotPack`, `SizedItem`, `approx_eq`
[INFO] [stdout]    --> src/lib.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |         approx_eq,
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] 193 |         PotPack,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 194 |         SizedItem
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot borrow `spaces` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib.rs:155:21
[INFO] [stdout]     |
[INFO] [stdout] 104 |             for (i, space) in spaces.iter().enumerate().rev() {
[INFO] [stdout]     |                               ------ immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 155 |                     spaces.push(Space {
[INFO] [stdout]     |                     ^^^^^^ mutable borrow occurs here
[INFO] [stdout] 156 |                         id: space.id,
[INFO] [stdout]     |                             -------- immutable borrow later used here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot borrow `spaces` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib.rs:155:21
[INFO] [stdout]     |
[INFO] [stdout] 104 |             for (i, space) in spaces.iter().enumerate().rev() {
[INFO] [stdout]     |                               ------ immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 155 |                     spaces.push(Space {
[INFO] [stdout]     |                     ^^^^^^ mutable borrow occurs here
[INFO] [stdout] 156 |                         id: space.id,
[INFO] [stdout]     |                             -------- immutable borrow later used here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `Command { std: "docker" "inspect" "b36fab50bab21b2e092aab27333e61df14a40f8a504e0316db63cfa7dd4f6004", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b36fab50bab21b2e092aab27333e61df14a40f8a504e0316db63cfa7dd4f6004", kill_on_drop: false }`
[INFO] [stdout] b36fab50bab21b2e092aab27333e61df14a40f8a504e0316db63cfa7dd4f6004